<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
            box-sizing: border-box;
        }
        body{
            height: 100vh;
            transition: all 1s;
        }
        
         .kaiguan{
             position: absolute;
             top: 20px;
             right: 50px;
             width: 40px;
             height: 20px;
             border: 2px solid black;
             border-radius: 20px;
             cursor: pointer;
             transition: all 3s;
         }
         .bai{
           
             position: absolute;
             top: 1.5px;
             left: 2px;
             height: 13px;
             width: 13px;
             background-color: rgb(0, 0, 0);
             border-radius: 50%;
             transition: all 1s;
         }
        .hei{
           
             position: absolute;
             top: 1.5px;
             right: 2px;
             height: 13px;
             width: 13px;
             background-color: rgb(11, 243, 81);
             border-radius: 50%;
             transition: all 1s;
         }
         h1{
             margin: 100px auto;
             width: 1000px;
             text-align: center;
         }
         p{
             margin: -60px auto;
             width: 1100px;
             text-align-last:center;
         }
    </style>
</head>
<body id="body" >
    <div class="kaiguan" >
        <div class="bai" id="anniu"></div>
    </div>
    <h1>Life of Pi</h1>
    <p >
        &emsp;&emsp;&emsp; He lives in Scarborough. He's a small, slim man – nomore than five foot five. Dark hair, dark eyes. Hair greyingat the temples. Can't be older than forty.            leasingcoffee-coloured complexion1. Mild fall weather, yet puts on abig winter parka with fur-lined hood2 for the walk to thediner. 
        He lives in Scarborough. He's a small, slim man – nomore than five foot five. Dark hair, dark eyes. Hair greyingat the temples. Can't be older than forty.            leasingcoffee-coloured complexion1. Mild fall weather, yet puts on abig winter parka with fur-lined hood2 for the walk to thediner. 
        He lives in Scarborough. He's a small, slim man – nomore than five foot five. Dark hair, dark eyes. Hair greyingat the temples. Can't be older than forty.            leasingcoffee-coloured complexion1. Mild fall weather, yet puts on abig winter parka with fur-lined hood2 for the walk to thediner. 
        He lives in Scarborough. He's a small, slim man – nomore than five foot five. Dark hair, dark eyes. Hair greyingat the temples. Can't be older than forty.            leasingcoffee-coloured complexion1. Mild fall weather, yet puts on abig winter parka with fur-lined hood2 for the walk to thediner. 
        He lives in Scarborough. He's a small, slim man – nomore than five foot five. Dark hair, dark eyes. Hair greyingat the temples. Can't be older than forty.            leasingcoffee-coloured complexion1. Mild fall weather, yet puts on abig winter parka with fur-lined hood2 for the walk to thediner. 
        He lives in Scarborough. He's a small, slim man – nomore than five foot five. Dark hair, dark eyes. Hair greyingat the temples. Can't be older than forty.            leasingcoffee-coloured complexion1. Mild fall weather, yet puts on abig winter parka with fur-lined hood2 for the walk to thediner. 
       </p>
     
    <script>
        var anniu =document.getElementById('anniu');
        var kaiguan = document.querySelector('.kaiguan');
        var body = document.getElementById('body');
       var temp = 1;
        anniu.addEventListener('click',function(){
            if(temp==1){
                this.className = 'hei';
                temp=0;
                kaiguan.style. border= '2px solid  rgb(11, 243, 81)';
                body.style. backgroundColor= 'rgb(7, 7, 29)';
                body.style.color = 'white';
            }else{
                this.className = 'bai';
                temp=1;
                kaiguan.style. border= '2px solid black';
                body.style. backgroundColor= 'white';
                body.style.color = 'black';
            }

        })
     
    </script>
</body>
</html>